is it compatible with the GoPro H2? what else do I need to buy to fit it whit the Gopro h2?
NOT compatible. You would need a simple video light, not a strobe.
Since the GoPro is for video, you probably want a video light. This does have an aiming light but would not be ideal for video. For flash photography however, this is an awesome flash. I don't think there would be any way to trigger the flash to work with GoPro in still mode.